#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#define OJ_TEST 0
#define LOCAL_TEST 0

#define M 1011

static int max(int a, int b){ return a>b?a:b; }
static int min(int a, int b) { return a<b?a:b; }
static int score[M];
static void solve(void){
	int cs, n, i, tot, avg;
	for(scanf("%d", &cs); cs>0; --cs){
		scanf("%d", &n);
		for(tot=0,i=0; i<n; ++i){
			scanf("%d", score+i);
			tot += score[i];
		}
		avg = tot/n;
		for(tot=0, i=0; i<n; ++i){
			if(score[i]>avg){
				++tot;
			}
		}
		printf("%.3f%%\n", 100.0*tot/n);
	}
}
#if OJ_TEST
	int main(int ac, char *av[]){
		solve();
		return 0;
	}
#elif  LOCAL_TEST
	void run(void){
		solve();
	}

#else

#endif
